Service code conversion
US3975595A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1974 |
| Grant date | Aug 17, 1976 |
| Priority date | — |
| Expiry date | Nov 25, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/44
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method of service code conversion and a service code conversion control circuit are disclosed for translating a dialed service access code in an abbreviated form into the directory number of a line circuit. A class-of-service indication assigned to a calling line circuit and a dialed abbreviated service access code are steered from a common register to a first translation circuit normally providing outgoing routing information for trunk marking. Instead of providing outgoing routing information, the first translation circuit or translator is strapped to recognize the class-of-service indicator and abbreviated dialed access code to enable a service code conversion control circuit. The service code conversion control directs the first translator to perform a conversion of the access code to a type of call indicator and a directory number, both of which are returned to the common register. A second translation circuit is enabled by the converted information which was returned to the common register and thereafter seizes a line circuit corresponding to the stored directory number and having a special service station terminated thereat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.